How to create an API in Java to change the password of a Unix user?

Question

I am new to Unix environment,

What I have to do is to create an API to change the password of a user having an Unix environment.

Have you written any code so far? If so, post what you've done so we can better assist you. — jrd1
– jrd1, Commented Oct 10, 2012 at 5:59
i have search for the code to be implemented as i have never executed a java code in the Unix environment. So i am searching for that also. So far i have searched ProcessBuilder pb = new ProcessBuilder("myshellScript.sh", "myArg1", "myArg2"); Map<String, String> env = pb.environment(); env.put("VAR1", "myValue"); env.remove("OTHERVAR"); env.put("VAR2", env.get("VAR1") + "suffix"); pb.directory(new File("myDir")); Process p = pb.start(); now i am trying to get the meaning of the variables like myarg1,var,othervar etc — Desperately After You
– Desperately After You, Commented Oct 10, 2012 at 7:35

Tobias Ritzau · Accepted Answer · 2012-10-10 05:59:44Z

2

Be really careful when dealing with passwords so there is no leak. Use exec() to invoke the system command (typically passwd)

answered Oct 10, 2012 at 5:59

Tobias Ritzau

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Mark Bramnik · Accepted Answer · 2012-10-10 06:06:41Z

1

Basically you'll need to work with 'passwd' unix command which is intended for changing the password.

You'll need to call this command from java by using the ProcessBuilder

or the older API Runtime

Now you'll also need to intercept the output of the passwd command if you want to run it interactively (like using some ui to enter the actual password and so on). In this case I would suggest you to read This article

You may consider also using some kind of predefined shell script that will allow to change the password non interactively. In this case you'll just invoke the script and it will do all the work.

Hope this helps

edited Oct 10, 2012 at 6:06

answered Oct 10, 2012 at 6:00

Mark Bramnik

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1 Comment

Desperately After You Over a year ago

i have search for the code to be implemented as i have never executed a java code in the Unix environment. So i am searching for that also. So far i have searched ProcessBuilder pb = new ProcessBuilder("myshellScript.sh", "myArg1", "myArg2"); Map<String, String> env = pb.environment(); env.put("VAR1", "myValue"); env.remove("OTHERVAR"); env.put("VAR2", env.get("VAR1") + "suffix"); pb.directory(new File("myDir")); Process p = pb.start();

Jacek · Accepted Answer · 2012-10-10 06:05:18Z

1

One hint. After you invoke the passwd command, you need to print password 2 times on stdout when system will ask for it.

To see how read form stdin after invoking exec() check: http://www.ensta-paristech.fr/~diam/java/online/io/javazine.html

answered Oct 10, 2012 at 6:05

Jacek

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